Ulvac C30HVRT - Page 81

C30HVRT Compressor Unit Instruction Manual
ULVAC CRYOGENICS INCORPORATED 8-3
2. Troubles during operation
Table 8-2 List of troubleshooting during operation
Problem Status Possible cause Corrective action
“RDY” indicator is
ON but remote
operation cannot
be performed.
Remote signal
fault.
Remote input-output
cable is not
connected or
connection of out put
signal from the
equipment is wrong.
Correct pin number of
output signal from the
equipment and connect
remote input- output
cables properly.
Operation
command is sent
but compressor
pump does not
start up.
Both “RDY” and
“RUN” indicators
light up.
Compressor motor
fault or disconnection
of motor wiring.
Call for servicing
※
.
“RUN” indicator is
ON but cryocooler
is not running.
CH1 indicator
remains OFF.
Fault or improper
connections of
remote input- output
cables.
If commands from the
equipment side are
correct, check remote
input-output cables and
their connection.
CH1 indicator is
ON.
Too many impurities
in helium gas.
Refer to cryocooler
manual.
Power-supply
voltage is too low.
Set power-supply voltage
within the available
range.
Relay fault inside
Controller or fault
such as cryocooler
cable disconnection.
Call for servicing
※
.
Replace the cryocooler
cable.
“RDY” indicator
lights OFF and the
compressor
stopped running.
“STS” indicators
light up and
buzzer sounds.
Interlock is activated. See detailed alarm codes
in the following section
(8.3) and take corrective
action.
After a short
electric power
interruption,
compressor does
not start operation.
After a short
electric power
interruption,
operation does
not restart.
“Alternate operating
mode” does not have
restart function for
short power
interruption.
“Momentary operating
mode” enables the
compressor to restart if
the electric power
recovers within 2 seconds
after interruption. If this
function is required,
change the operation
mode by modification of
remote wiring.
Refer to Section 2 and
Section 4.
After power is
interrupted for
longer than 2
seconds,
compressor
does not start
operation.
Longer electric
power interruption
than set time (2
seconds).
Compressor needs
restart.
※ If the problem is not solved, please contact our Service Engineering Division or the
nearest customer support center.